Physical and Spectroscopic Properties of Yb~3+-doped SiO_2-Bi_2O_3-B_2O_3 Glasses

Yb3+-doped 60 SiO2-xBi2O3-(30-x)B2O3-2K2O- 7Na2O-1Yb2O3(z=0, 5, 10, 15, 20, 25, 30) were prepared. The physical and spectroscopic properties of Yb3+doped SiO2- Bi2O3-B2O3 were studied. The refractive index, density of Yb3+ doped SiO2-Bi2O3-B2O3 glasses increase with the increase of Bi2O3 content, while the Tg, Tf decrease with the increase of Bi2O3 content. The system of 60 SiO2-15Bi2O3-15B2O3-2K2O-7Na2O-1Yb2O3 glass possesses higher asymmetry. This sample exhibits higher peak absorption cross section(σabs) and integrated absorption cross section (∑abs): 1.97pm2 and 5.32×104pm3 respectively. Also this glass has higher spontaneous emission probability(Arad) 1620S-1, the τrad (calculated emission lifetime) is 0.617ms. The measured emission lifetime(τf) has strong relations with the OH- content in glasses, as the B2O3 content increases from Omol% to 30mol%, the τm increases from 0.39 to 0.87ms.